Notebook[List[Cell[BoxData[FormBox[RowBox[List[SubscriptBox["m", "i"], "=", FractionBox[RowBox[List[SubscriptBox["Q", "i"], "-", SubscriptBox["b", "i"]]], SubscriptBox[StyleBox["V", Rule[FontSlant, "Plain"]], "bus"]]]], TraditionalForm]], "Input"]]]